public function process(Tracker_IDisplayTrackerLayout $layout, $request, $current_user)
 {
     parent::process($layout, $request, $current_user);
     switch ($request->get('func')) {
         case 'textboxlist':
             if ($request->get('keyword')) {
                 echo $this->textboxlist($request->get('keyword'));
             } else {
                 echo '[]';
             }
             exit;
             break;
     }
 }